Usage:
Wisconsin Episode (IL,IN,IA,MI,MN,OH,WI)
A time-transgressive (diachronic) term applied to glacial-related deposits of the north-central U.S.
Subunits:
(ascending) --all in IL: Athens Subepisode, Michigan Subepisode.
Geologic age:
Quaternary (Pleistocene; Sangomanian to Wisconsinan Age)
Type section, locality, area and/or origin of name:
[Type area: Lake Michigan Lobe extending from south of Peoria, IL, to Straits of Mackinac, MI, encompassing the type sections of the constituent lithostratigraphic units (see Hansel and Johnson, 1996).]
AAPG geologic province:
Illinois basin
Michigan basin
Wisconsin arch
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).